CH-3 METALS AND NON-METALS
Q1Name the following
a)The most ductile metal
Ans: Gold
b) The most malleable metals
Ans: Gold and Silver
c) The best conductors of heat
Ans: Silver and Copper
d) Metals which are poor conductors of heat
Ans: Lead and mercury
e) A liquid non-metal
Ans: Bromine
f) A liquid metal
Ans: Mercury
g)Two metals that have low melting points
Ans: Gallium and Caesium
h) A lustrous non-metal
Ans: Iodine
i) The hardest natural substance
Ans : Diamond
j) An allotrope of carbon which conduct electricity
Ans: Graphite
Q2Explain the following
1
, a)Malleability-The property of metals to be beaten into thin sheets is called
malleability.
b)Ductility- The property of metals to be drawn into thin wires is called
ductility.
c)Metallic lustre-The property of metals having a shiny surface in their pure
state is called metallic lustre.
d)Sonorous- The property of metals that produces a sound on striking it is
called sonorous.
e)Allotrope- Carbon can exist in different forms. Each form is called an
allotrope. Allotropes of carbon are -: Diamond, Graphite.
Q3.Differentiate between metals and non-metals on the basis of their
physical properties.
METALS NON METALS
1.They exist as solids except They exist in all three states.
mercury.
2.They are generally hard 2.They are not hard.
3.They have high melting and 3.They have low melting and boiling
boiling point. point.
4.They are good conductors of heat 4.They are poor conductors of heat
and electricity. and electricity.
5.They are malleable and ductile. 5.They are not malleable and
ductile.
6.They are lustrous and sonorous. 6.They are not lustrous and
sonorous.
7.They have high densities. 7 They have low densities.
CHEMICAL PROPERTIES OF METAL
I REACTION OF METALS WITH AIR
Metal + Oxygen → metal oxide
2
Q1Name the following
a)The most ductile metal
Ans: Gold
b) The most malleable metals
Ans: Gold and Silver
c) The best conductors of heat
Ans: Silver and Copper
d) Metals which are poor conductors of heat
Ans: Lead and mercury
e) A liquid non-metal
Ans: Bromine
f) A liquid metal
Ans: Mercury
g)Two metals that have low melting points
Ans: Gallium and Caesium
h) A lustrous non-metal
Ans: Iodine
i) The hardest natural substance
Ans : Diamond
j) An allotrope of carbon which conduct electricity
Ans: Graphite
Q2Explain the following
1
, a)Malleability-The property of metals to be beaten into thin sheets is called
malleability.
b)Ductility- The property of metals to be drawn into thin wires is called
ductility.
c)Metallic lustre-The property of metals having a shiny surface in their pure
state is called metallic lustre.
d)Sonorous- The property of metals that produces a sound on striking it is
called sonorous.
e)Allotrope- Carbon can exist in different forms. Each form is called an
allotrope. Allotropes of carbon are -: Diamond, Graphite.
Q3.Differentiate between metals and non-metals on the basis of their
physical properties.
METALS NON METALS
1.They exist as solids except They exist in all three states.
mercury.
2.They are generally hard 2.They are not hard.
3.They have high melting and 3.They have low melting and boiling
boiling point. point.
4.They are good conductors of heat 4.They are poor conductors of heat
and electricity. and electricity.
5.They are malleable and ductile. 5.They are not malleable and
ductile.
6.They are lustrous and sonorous. 6.They are not lustrous and
sonorous.
7.They have high densities. 7 They have low densities.
CHEMICAL PROPERTIES OF METAL
I REACTION OF METALS WITH AIR
Metal + Oxygen → metal oxide
2
